@stardazed/streams-fetch-adapter

This package provides helper functions to create adapted versions of a runtime's native fetch function and Response class to work with ReadableStream implementations other than the built-in one.

If the runtime does not support ReadableStream at all, the provided custom implementation will be used to add support for streams to both fetch and Response transparently.

Support is also added to fetch to allow a ReadableStream for the body to send to the server, but unlike the fetch spec describes, it does not send the data incrementally to the server. Instead it reads the entire stream and then sends it as a Blob body. Upload streaming must be implemented by the user-agent and cannot be simulated.

⚠️ Important: this is NOT a polyfill. This package only provides helper functions that can be used to make adapted types for a streams implementation.

👉 If you want a polyfill for the Stardazed streams implementation, use the ⭐️Stardazed streams polyfill⭐️.

Installation

Pick your preferred package provider program:

npm install @stardazed/streams-fetch-adapter
pnpm install @stardazed/streams-fetch-adapter
yarn add @stardazed/streams-fetch-adapter

⚠️ Important: This library requires TypeScript 3.6 or newer due to type changes in the standard library.

Usage

Use this package if you want to adapt fetch and Response to support your custom ReadableStream implementation, this may be for things like mocks or modified versions of built-in streams or for a full replacement, like Stardazed streams.

You only need to adapt the Response class if you want to manually construct a Response with your custom ReadableStream instance as the body. If you just want to use your implementation for a Response returned from fetch you only need to adapt fetch.

import { createAdaptedFetch, createAdaptedResponse } from "@stardazed/streams-fetch-adapter";

class MyReadableStream { /* implements ReadableStream interface */ }

// create adapted types...
const myFetch = createAdaptedFetch(window.fetch, window.ReadableStream, MyReadableStream);
const myResponse = createAdaptedResponse(window.Response, window.ReadableStream, MyReadableStream);

// ...and use them like the built-in versions
myFetch("./some-resource.txt").then(resp => resp.body /* <-- is an instance of MyReadableStream */);
myFetch("some-server.com/upload", { method: "post", body: new MyReadableStream(...) }); // works
const blob = new myResponse(new MyReadableStream(...)).blob(); // works

Copyright

© 2018-Present by Arthur Langereis - @zenmumbler

License

MIT